Description

If we try to find this value: "url:framework.zend.com", query parser will break it into three different terms: 'url:framework', 'url:zend' and 'url:com'.
No one of these terms matches 'url:framework.zend.com'

So we get empty result set for this query.

There is no way to search through non-tokenized fields with current query language now.
It's possible with API methods: